<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

  <script>

    eval('2+3');//5
    eval('var x=10;var y=20;console.log(x*y);'); //200
    var student = {
      name: 'zhansgan',
      age: 23,
      study: function() {
        console.log(this.name + '的年龄是' + this.age + '岁');
      }
    };
    console.log(student.name);
    student.study();
  </script>
</head>
<body>

</body>
</html>